[Bug c++/69564] lto and/or C++ make scimark2 LU slower

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69564

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |jason at gcc dot gnu.org

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to vincenzo Innocente from comment #3)
> > Any reason you are using the c++ driver here?
> Because I am interested in C++ performance
> never imagined that the c++ front-end could make a difference on such a
> code...
> From my point of view it is even a more severe regression than just "lto"

Yeah, didn't try to figure out whether the C vs. C++ thing is a 
regression.  But I suspect the change to the C++ loop lowering.

Certainly needs closer investigation.